Free ASVAB Section 3: Mechanical Comprehension Exam braindumps download (ASVAB Section 3: Mechanical Comprehension exam dumps Free)

QUESTION: 51

Helical gears have ______________.

straight teeth
slanted teeth
teeth of unequal size
no advantage over spur gears

Answer(s): B

Explanation:

The teeth of helical gears are slanted.

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QUESTION: 52

In the figure above, which pillar supports the greater load of the cat?

Pillar A
Pillar B
Both pillars support the cat equally.
It’s impossible to determine from the information given.

Answer(s): B

Explanation:

The cat is closer to Pillar B, so Pillar B bears more weight.

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QUESTION: 53

Wheel A has a diameter of 10 feet. Wheel B has a diameter of 8 feet.
If both wheels revolve at the same rate, Wheel B will cover a linear distance of 16 feet ___________.

at the same time as Wheel A
more slowly than Wheel A
in twice the time as Wheel A
faster than Wheel A

Answer(s): B

Explanation:

Wheel B has to make more revolutions than Wheel A to cover the same amount of distance, so it will go slower.

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QUESTION: 54

What effort must be used to lift a 30-pound cat (see the figure above) using a first-class lever? (Don’t include the weight of the lever in your calculations.)

10 pounds
15 pounds
50 pounds
5 pounds

Answer(s): A

Explanation:

E stands for effort needed. 30 (weight of the cat) × 2 (length of resistance arm) = x × 6 (length of effort arm).

Do a little multiplication, and you get 60 = 6x. To isolate x, divide each side by 6:
60 ÷ 6 = 6x ÷ 6, or 10 = x.

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